The effects of season and ontogeny in the diet of Piabarchus stramineus (Eigenmann 1908) (Characidae: Stevardiinae) from southern Brazil
Abstract Aim In the present work we describe and analyze the diet of a small characin species, Piabarchus stramineus, from the Ibicuí River, Uruguay River Basin, southern Brazil. Methods Samples were collected monthly from April 2001 to March 2002 with seine net. All fish were measured, weighed, a...
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Limnologia
2022-11-01
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| Series: | Acta Limnologica Brasiliensia |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2022000100726&tlng=en |
| _version_ | 1828124518005080064 |
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| author | Vinicius Renner Lampert Tatiana Schmidt Dias Karina Keyla Tondato-Carvalho Clarice Bernhardt Fialho |
| author_facet | Vinicius Renner Lampert Tatiana Schmidt Dias Karina Keyla Tondato-Carvalho Clarice Bernhardt Fialho |
| author_sort | Vinicius Renner Lampert |
| collection | DOAJ |
| description | Abstract Aim In the present work we describe and analyze the diet of a small characin species, Piabarchus stramineus, from the Ibicuí River, Uruguay River Basin, southern Brazil. Methods Samples were collected monthly from April 2001 to March 2002 with seine net. All fish were measured, weighed, and had its stomach extruded for gut content analysis. Months were grouped in seasons and fish were classified within three standard length classes (SLC). We tested for possible alimentary differences between the different seasons of the year and standard length classes. Results The analysis of the content in 301 stomachs identified 27 food items and low to intermediary niche breadth. The main food item/category was allochthonous insects, regardless of the seasons, and P. stramineus can be classified as an insectivorous species. We observed no food overlap between smaller and larger fish (SLC1 and SLC3). On the other hand, we observed food overlap between small and intermediary fish (SLC1 and SLC2) and between intermediary and large fish (SLC2 and SLC3), evidencing a transition in food consumption along size classes. A temporal variation in diet composition was also observed among size classes. Thus, different sized fish differed in their diets, with smaller fish feeding mainly on cladocerans (SLC1 and SLC2) and larger fish (SLC3) feeding mainly on allochthonous Diptera and Hymenoptera. Conclusions The species diet varies in time (seasons) and such variation is different in each size class. Allochthonous food items were important in the diet of the species in the different developmental phases, especially for larger fish, with autochthonous items also important, especially for smaller fish. The allochthonous food items are strongly related to the ciliary forest; thus, we emphasize the importance of the conservation of such environments. |
| first_indexed | 2024-04-11T15:08:38Z |
| format | Article |
| id | doaj.art-8109e88b12b34b7c9d08c9003fc7d700 |
| institution | Directory Open Access Journal |
| issn | 2179-975X |
| language | English |
| last_indexed | 2024-04-11T15:08:38Z |
| publishDate | 2022-11-01 |
| publisher | Associação Brasileira de Limnologia |
| record_format | Article |
| series | Acta Limnologica Brasiliensia |
| spelling | doaj.art-8109e88b12b34b7c9d08c9003fc7d7002022-12-22T04:16:44ZengAssociação Brasileira de LimnologiaActa Limnologica Brasiliensia2179-975X2022-11-013410.1590/s2179-975x5621The effects of season and ontogeny in the diet of Piabarchus stramineus (Eigenmann 1908) (Characidae: Stevardiinae) from southern BrazilVinicius Renner Lamperthttps://orcid.org/0000-0002-5700-4913Tatiana Schmidt Diashttps://orcid.org/0000-0002-1969-1951Karina Keyla Tondato-Carvalhohttps://orcid.org/0000-0002-9493-1126Clarice Bernhardt Fialhohttps://orcid.org/0000-0001-7908-5534Abstract Aim In the present work we describe and analyze the diet of a small characin species, Piabarchus stramineus, from the Ibicuí River, Uruguay River Basin, southern Brazil. Methods Samples were collected monthly from April 2001 to March 2002 with seine net. All fish were measured, weighed, and had its stomach extruded for gut content analysis. Months were grouped in seasons and fish were classified within three standard length classes (SLC). We tested for possible alimentary differences between the different seasons of the year and standard length classes. Results The analysis of the content in 301 stomachs identified 27 food items and low to intermediary niche breadth. The main food item/category was allochthonous insects, regardless of the seasons, and P. stramineus can be classified as an insectivorous species. We observed no food overlap between smaller and larger fish (SLC1 and SLC3). On the other hand, we observed food overlap between small and intermediary fish (SLC1 and SLC2) and between intermediary and large fish (SLC2 and SLC3), evidencing a transition in food consumption along size classes. A temporal variation in diet composition was also observed among size classes. Thus, different sized fish differed in their diets, with smaller fish feeding mainly on cladocerans (SLC1 and SLC2) and larger fish (SLC3) feeding mainly on allochthonous Diptera and Hymenoptera. Conclusions The species diet varies in time (seasons) and such variation is different in each size class. Allochthonous food items were important in the diet of the species in the different developmental phases, especially for larger fish, with autochthonous items also important, especially for smaller fish. The allochthonous food items are strongly related to the ciliary forest; thus, we emphasize the importance of the conservation of such environments.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2022000100726&tlng=enallochthonous insectssize classesfeedingniche breadthfood overlap |
| spellingShingle | Vinicius Renner Lampert Tatiana Schmidt Dias Karina Keyla Tondato-Carvalho Clarice Bernhardt Fialho The effects of season and ontogeny in the diet of Piabarchus stramineus (Eigenmann 1908) (Characidae: Stevardiinae) from southern Brazil Acta Limnologica Brasiliensia allochthonous insects size classes feeding niche breadth food overlap |
| title | The effects of season and ontogeny in the diet of Piabarchus stramineus (Eigenmann 1908) (Characidae: Stevardiinae) from southern Brazil |
| title_full | The effects of season and ontogeny in the diet of Piabarchus stramineus (Eigenmann 1908) (Characidae: Stevardiinae) from southern Brazil |
| title_fullStr | The effects of season and ontogeny in the diet of Piabarchus stramineus (Eigenmann 1908) (Characidae: Stevardiinae) from southern Brazil |
| title_full_unstemmed | The effects of season and ontogeny in the diet of Piabarchus stramineus (Eigenmann 1908) (Characidae: Stevardiinae) from southern Brazil |
| title_short | The effects of season and ontogeny in the diet of Piabarchus stramineus (Eigenmann 1908) (Characidae: Stevardiinae) from southern Brazil |
| title_sort | effects of season and ontogeny in the diet of piabarchus stramineus eigenmann 1908 characidae stevardiinae from southern brazil |
| topic | allochthonous insects size classes feeding niche breadth food overlap |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S2179-975X2022000100726&tlng=en |
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